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123 pfowler 1 
#include <avr/io.h>
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#include <stdlib.h>
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#include "wire.h"
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#include "avrutil.h"
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#include <util/delay.h>
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#include "e2p.h"
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void e2p_init() {
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  e2p.i2c_addr = 0x50;
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}
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void e2p_init_addr(uint8_t i2c_addr) {
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  e2p.i2c_addr = i2c_addr;
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}
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uint8_t e2p_readByte(uint16_t address) {
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  if (!e2p.i2c_addr) return 0xFF;
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  uint8_t buffer = 0xFF;
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  e2p_readBytes(address, &buffer, 1);
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  return buffer;
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}
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uint8_t e2p_busy() {
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  i2c_beginTransmission(e2p.i2c_addr);
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  return i2c_endTransmission(1);
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}
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void e2p_flush() {
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 while (e2p_busy()) {
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    _delay_us(500);
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 }
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}
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void e2p_readBytes(uint16_t address, uint8_t* buffer, uint8_t length) {
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  if (!e2p.i2c_addr) return;
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  i2c_beginTransmission(e2p.i2c_addr);
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  i2c_writeByte((int) address >> 8);	// MSB
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  i2c_writeByte((int) address & 0xFF);	// LSB
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  i2c_endTransmission(0);
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  i2c_requestFrom(e2p.i2c_addr, length, 1);
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  uint8_t c;
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  for ( c = 0; c < length; c++)
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    if (i2c_available()) buffer[c] = i2c_read();
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}
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void e2p_writeByte(uint16_t address, uint8_t data) {
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    if (!e2p.i2c_addr) return;
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    i2c_beginTransmission(e2p.i2c_addr);
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    i2c_writeByte((int) address >> 8);	// MSB
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    i2c_writeByte((int) address & 0xFF);	// LSB
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    i2c_writeByte(data);
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    i2c_endTransmission(1);
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}
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void e2p_writeBytes(uint16_t address, uint8_t* data, uint8_t length) {
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    if (!e2p.i2c_addr) return;
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    i2c_beginTransmission(e2p.i2c_addr);
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    i2c_writeByte((int) address >> 8);	// MSB
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    i2c_writeByte((int) address & 0xFF);	// LSB
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    uint8_t c;
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    for ( c = 0; c < length; c++)
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      i2c_writeByte(data[c]);
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    i2c_endTransmission(1);
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}